1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgvertexcolormaterial_p.h"
#include <qglshaderprogram.h>
QT_BEGIN_NAMESPACE
class QSGVertexColorMaterialShader : public QSGMaterialShader
{
public:
virtual void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect);
virtual char const *const *attributeNames() const;
static QSGMaterialType type;
private:
virtual void initialize();
virtual const char *vertexShader() const;
virtual const char *fragmentShader() const;
int m_matrix_id;
int m_opacity_id;
};
QSGMaterialType QSGVertexColorMaterialShader::type;
void QSGVertexColorMaterialShader::updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *)
{
if (!(newEffect->flags() & QSGMaterial::Blending) || state.isOpacityDirty())
program()->setUniformValue(m_opacity_id, state.opacity());
if (state.isMatrixDirty())
program()->setUniformValue(m_matrix_id, state.combinedMatrix());
}
char const *const *QSGVertexColorMaterialShader::attributeNames() const
{
static const char *const attr[] = { "vertexCoord", "vertexColor", 0 };
return attr;
}
void QSGVertexColorMaterialShader::initialize()
{
m_matrix_id = program()->uniformLocation("matrix");
m_opacity_id = program()->uniformLocation("opacity");
}
const char *QSGVertexColorMaterialShader::vertexShader() const {
return
"attribute highp vec4 vertexCoord; \n"
"attribute highp vec4 vertexColor; \n"
"uniform highp mat4 matrix; \n"
"uniform highp float opacity; \n"
"varying lowp vec4 color; \n"
"void main() { \n"
" gl_Position = matrix * vertexCoord; \n"
" color = vertexColor * opacity; \n"
"}";
}
const char *QSGVertexColorMaterialShader::fragmentShader() const {
return
"varying lowp vec4 color; \n"
"void main() { \n"
" gl_FragColor = color; \n"
"}";
}
/*!
\class QSGVertexColorMaterial
\brief The QSGVertexColorMaterial provides a convenient way of rendering per-vertex
colored geometry in the scene graph.
The vertex color material will give each vertex in a geometry a color. Pixels between
vertices will be linearly interpolated. The colors can contain transparency.
The geometry to be rendered with vertex color must have the following layout. Attribute
position 0 must contain vertices. Attribute position 1 must contain colors, a tuple of
4 values with RGBA layout. Both floats in the range of 0 to 1 and unsigned bytes in
the range 0 to 255 are valid for the color values. The
QSGGeometry::defaultAttributes_ColoredPoint2D() constructs an attribute set
compatible with this material.
The vertex color material respets both current opacity and current matrix when
updating it's rendering state.
*/
QSGVertexColorMaterial::QSGVertexColorMaterial()
{
setFlag(Blending, true);
}
/*!
Sets if the renderer should treat colors as opaque.
Setting this flag can in some cases improve performance.
*/
void QSGVertexColorMaterial::setColorsAreOpaque(bool opaqueHint)
{
setFlag(Blending, !opaqueHint);
}
/*!
\internal
*/
QSGMaterialType *QSGVertexColorMaterial::type() const
{
return &QSGVertexColorMaterialShader::type;
}
/*!
\internal
*/
QSGMaterialShader *QSGVertexColorMaterial::createShader() const
{
return new QSGVertexColorMaterialShader;
}
QT_END_NAMESPACE
|
